NSF Lube is a fast-growing chain of oil-change stores. The following data are available for last years services.

• NSF Lube performed 473,700 oil changes last year. It had budgeted 432,600 oil changes, averaging 12 minutes each.
• Standard variable labor and support costs per oil change were as follows.

Direct oil specialist services: 12 minutes at $20 per hour	$	4.00
Variable support staff and overhead: 7.5 minutes at $20 per hour		2.50

• Fixed overhead costs:

Annual budget $1,036,600

• Fixed overhead is applied at the rate of $2.40 per oil change.
• Actual oil change costs:

Direct oil specialist services: 473,700 changes averaging 16 minutes at $24 per hour	$	3,031,680
Variable support staff and overhead: 0.13 labor-hours at $15 per hour 473,700 changes		923,715
Fixed overhead		1,245,000

Required:

a. Prepare a cost variance analysis for each variable cost for last year. b. Prepare a fixed overhead cost variance analysis.